Symbols:Greek/Iota

Iota
It is pronounced yot-ta, not the incorrect but often-heard eye-oh-ta.

Inclusion Mapping
Used by some sources to denote the mapping on $S$ to $T$ where $S \subseteq T$:
 * $\iota_S: S \to T: \forall x \in S: \map {\iota_S} x = x$