Aspiration

Aspiration refers to the delay of vibration of the vocal cords after the production of a voiceless consonant.

Example
There is a short period of air stream heard as a 'h'-like puff, designated with the phonetic symbol [h], as in English pin: [phɪn].

Comment
In some languages (cf. English) aspiration is predictable and position-bound.

Link
Utrecht Lexicon of Linguistics