They are named after the initial letters of the three subgroups:

There are 12 different free pentominoes, named after the letters of the Latin alphabet they resemble.

The Yusupovs founded a short-lived couture house Irfé, named after the first two letters of their first names.

The locals named him Tião, after the last four letters in the town's name.

There are thirteen planets in the system, named, rather unimaginatively, after the letters of the alphabet.

Mouse family - a pair of mice whose offspring are named after the letters of the alphabet.

The manga Beelzebub contains an army of demons named after the letters of the alphabet.

Command abbreviations are conventionally named after the first letters of the command they represent, so may be expanded to .

These are usually named after the first six letters.

Gey named the sample HeLa, after the initial letters of Henrietta Lacks' name.