Here are all the lowercase one-, two-, and three-letter shortcuts on Wikipedia. (Note that some of them might not be shortcuts at all, especially real words in the three-letter range.) Enable Popups to find out what they are by hovering over them.
a | b | c | d | e | f | g | h | i | j | k | l | m | n | o | p | q | r | s | t | u | v | w | x | y | z |
aa | bb | cc | dd | ee | ff | gg | hh | ii | jj | kk | ll | mm | nn | oo | pp | rr | ss | tt | uu | vv | ww | xx | yy | zz | |
aaa | bbb | ccc | ddd | eee | fff | ggg | hhh | iii | jjj | kkk | lll | mmm | nnn | ooo | ppp | qqq | rrr | sss | ttt | uuu | vvv | www | xxx | yyy | zzz |