Alphabitties (not to be confused with the pasta in a can) are alphabetical tiles used to keep track of your blocks and your rows.
Just clip them to your block (use a wonder clip) or row. They are great for keeping organized when cutting your fabric while following the pattern - put the letter on top of the stack of A pieces, the B tile on top of the stack of B squares etc...
Regular Package - contains 26 Letters and 10 numbers
Expansion Pack also available - package contains 26 double letters (AA-ZZ) and 10 numbers (10-19)
By Its Sew Emma