| Σ | # | Presentation | Description | Related |
| 7 | 124 | ⟨a, b | aab=a, bbb=1⟩ | Finite non-commutative monoid with 12 elements | 23 iso, 38 anti-iso |
| 8 | 458 | ⟨a, b | aaaa=1, abbb=1⟩ | Isomorphic to ℤ12 | 325 iso |
| 8 | 645 | ⟨a, b | ab=aa, bbb=b⟩ | Finite non-commutative monoid with 12 elements | 1 anti-iso |
| 9 | 1646 | ⟨a, b | aab=bb, aba=a⟩ | Finite non-commutative monoid with 12 elements | 2 iso |
| 9 | 1998 | ⟨a, b | aaa=a, bbbb=a⟩ | Isomorphic to ℕ(12 = 4) | 6 iso |
| 9 | 2018 | ⟨a, b | aaa=b, bbbb=a⟩ | Isomorphic to ℕ(12 = 1) | 27 iso |
| 9 | 2019 | ⟨a, b | aaa=b, bbbb=b⟩ | Isomorphic to ℕ(12 = 3) | 23 iso |
| 9 | 2259 | ⟨a, b | ab=aa, bbb=bb⟩ | Finite non-commutative monoid with 12 elements | |
| 10 | 5040 | ⟨a, b | aaa=aa, bbbb=a⟩ | Isomorphic to ℕ(12 = 8) | |
| 10 | 5072 | ⟨a, b | aaa=ab, bbbb=a⟩ | Isomorphic to ℕ(12 = 5) | 7 iso |
| 10 | 5092 | ⟨a, b | aaa=bb, bbbb=a⟩ | Isomorphic to ℕ(12 = 2) | 43 iso |
| 10 | 5202 | ⟨a, b | aab=bb, abba=a⟩ | Finite non-commutative monoid with 12 elements | 9 iso, 32 anti-iso |
| 10 | 5330 | ⟨a, b | aaa=ab, bab=bb⟩ | Finite non-commutative monoid with 12 elements | 1 iso |
| 10 | 6597 | ⟨a, b | aaa=b, bbbb=bb⟩ | Isomorphic to ℕ(12 = 6) | 4 iso |
| 10 | 6660 | ⟨a, b | aab=a, bbbb=ba⟩ | Finite non-commutative monoid with 12 elements | 1 anti-iso |
| 10 | 6661 | ⟨a, b | aab=a, bbbb=bb⟩ | Finite non-commutative monoid with 12 elements | 1 anti-iso |
| 10 | 7105 | ⟨a, b | ab=aa, bbaa=bb⟩ | Finite non-commutative monoid with 12 elements | 2 iso |
| 11 | 12897 | ⟨a, b | aab=aaa, baaa=b⟩ | Finite non-commutative monoid with 12 elements | 5 iso |
| 11 | 12910 | ⟨a, b | aab=aaa, bbbb=a⟩ | Isomorphic to ℕ(12 = 9) | 2 iso |
| 11 | 15428 | ⟨a, b | aaa=aa, abbbb=b⟩ | Finite non-commutative monoid with 12 elements | |
| 11 | 15996 | ⟨a, b | aaa=ab, aabb=bb⟩ | Finite non-commutative monoid with 12 elements | 2 iso |
| 11 | 16057 | ⟨a, b | aaa=bb, aabb=ab⟩ | Finite non-commutative monoid with 12 elements | 2 iso, 2 anti-iso |
| 11 | 16104 | ⟨a, b | aab=aa, abab=bb⟩ | Finite non-commutative monoid with 12 elements | |
| 11 | 16274 | ⟨a, b | aab=bb, aaaa=ab⟩ | Finite non-commutative monoid with 12 elements | 1 iso |
| 11 | 16275 | ⟨a, b | aab=bb, aaaa=ba⟩ | Finite non-commutative monoid with 12 elements | |
| 11 | 16448 | ⟨a, b | aba=bb, aabb=aa⟩ | Finite non-commutative monoid with 12 elements | 2 iso |
| 11 | 19773 | ⟨a, b | aba=b, bbbbb=aa⟩ | Finite commutative monoid with 12 elements | |
| 11 | 19917 | ⟨a, b | aaa=b, bbbb=abb⟩ | Isomorphic to ℕ(12 = 7) | 2 iso |
| 11 | 20054 | ⟨a, b | aab=b, aaaa=bba⟩ | Finite non-commutative monoid with 12 elements | |
| 11 | 20686 | ⟨a, b | bb=aa, aaaaab=a⟩ | Finite commutative monoid with 12 elements | 15 iso |
| 11 | 20787 | ⟨a, b | ab=aa, baaaa=bb⟩ | Finite non-commutative monoid with 12 elements | 7 iso |
| 11 | 21086 | ⟨a, b | bb=aa, aaaa=aba⟩ | Finite non-commutative monoid with 12 elements | 4 iso |
| 11 | 21092 | ⟨a, b | bb=aa, aaab=aba⟩ | Finite non-commutative monoid with 12 elements | 3 iso |
| 11 | 21112 | ⟨a, b | bb=aa, abab=aba⟩ | Finite non-commutative monoid with 12 elements | |
| 11 | 24147 | ⟨a, b | aa=a, abbbbbb=b⟩ | Finite non-commutative monoid with 12 elements | |
| 11 | 24991 | ⟨a, b | ab=a, baaaaa=bb⟩ | Finite non-commutative monoid with 12 elements | |
| 11 | 25603 | ⟨a, b | ab=a, bbaaa=bbb⟩ | Finite non-commutative monoid with 12 elements | |
| Σ | # | Presentation | Mapping |
| 9 | 1966 | ⟨a, b | aba=b, aabba=1⟩ | φ(a) = a, φ(b) = b |
| 9 | 1974 | ⟨a, b | aba=b, baaab=1⟩ | φ(a) = a, φ(b) = b |
| 10 | 4111 | ⟨a, b | bab=aba, aabb=1⟩ | φ(a) = b, φ(b) = baa |
| 10 | 4113 | ⟨a, b | bab=aba, abba=1⟩ | φ(a) = b, φ(b) = baa |
| 10 | 4601 | ⟨a, b | abba=b, aabbb=1⟩ | φ(a) = b, φ(b) = a |
| 10 | 4606 | ⟨a, b | abba=b, abbba=1⟩ | φ(a) = b, φ(b) = a |
| 10 | 4609 | ⟨a, b | abba=b, baabb=1⟩ | φ(a) = b, φ(b) = a |
| 10 | 5881 | ⟨a, b | aabb=1, ababa=b⟩ | φ(a) = b, φ(b) = baa |
| 10 | 5945 | ⟨a, b | abba=1, ababa=b⟩ | φ(a) = b, φ(b) = baa |
| 10 | 5958 | ⟨a, b | abba=1, babab=a⟩ | φ(a) = b, φ(b) = baa |
| 11 | 11855 | ⟨a, b | aaba=ab, aaabb=1⟩ | φ(a) = a, φ(b) = b |
| 11 | 11858 | ⟨a, b | aaba=ab, aabba=1⟩ | φ(a) = a, φ(b) = b |
| 11 | 11864 | ⟨a, b | aaba=ab, abbaa=1⟩ | φ(a) = a, φ(b) = b |
| 11 | 11869 | ⟨a, b | aaba=ab, baaab=1⟩ | φ(a) = a, φ(b) = b |
| 11 | 11876 | ⟨a, b | aaba=ab, bbaaa=1⟩ | φ(a) = a, φ(b) = b |
| 11 | 12019 | ⟨a, b | abab=aa, aabbb=1⟩ | φ(a) = b, φ(b) = a |
| 11 | 12026 | ⟨a, b | abab=aa, abbba=1⟩ | φ(a) = b, φ(b) = a |
| 11 | 12031 | ⟨a, b | abab=aa, baabb=1⟩ | φ(a) = b, φ(b) = a |
| 11 | 12037 | ⟨a, b | abab=aa, bbaab=1⟩ | φ(a) = b, φ(b) = a |
| 11 | 12040 | ⟨a, b | abab=aa, bbbaa=1⟩ | φ(a) = b, φ(b) = a |
| 11 | 15160 | ⟨a, b | aab=ba, ababbb=1⟩ | φ(a) = aa, φ(b) = b |
| 11 | 15166 | ⟨a, b | aab=ba, abbbab=1⟩ | φ(a) = aa, φ(b) = b |
| 11 | 15180 | ⟨a, b | aab=ba, bababb=1⟩ | φ(a) = aa, φ(b) = b |
| 11 | 15183 | ⟨a, b | aab=ba, babbba=1⟩ | φ(a) = aa, φ(b) = b |
| 11 | 15190 | ⟨a, b | aab=ba, bbabab=1⟩ | φ(a) = aa, φ(b) = b |
| 11 | 15195 | ⟨a, b | aab=ba, bbbaba=1⟩ | φ(a) = aa, φ(b) = b |
| 11 | 18621 | ⟨a, b | aba=b, aaaabab=1⟩ | φ(a) = a, φ(b) = b |
| 11 | 18626 | ⟨a, b | aba=b, aaababa=1⟩ | φ(a) = a, φ(b) = b |
| 11 | 18635 | ⟨a, b | aba=b, aababaa=1⟩ | φ(a) = a, φ(b) = b |
| 11 | 18646 | ⟨a, b | aba=b, abaaaab=1⟩ | φ(a) = a, φ(b) = b |