The following lower-case Greek letters are not likely to cause much trouble, since they closely resemble some printed or written form of their Roman counterparts. They are presented in two different fonts, to demonstrate that their shape can vary according to taste:
You will have noticed that sigma (= s) has two forms: σ at the beginning or in the middle of a word (INITIAL or MEDIAL sigma) and ς at the end of a word (FINAL sigma).
Here are the more difficult or confusing lower-case letters:
Notice these letters that descend below the base-line: