selector

Someone or something which selects or chooses.
(cricket) An administrator responsible for selecting which players will play for a side.
(computing) A matching expression in a stylesheet determining which elements in the markup are affected by a style.
(computing) A pointer to a structure describing a segment of memory.
(internet) A text string transmitted to a Gopher server, identifying the resource to be retrieved.
(music) A disc jockey.

Suffix from English select.

English

select