Æ

1. A letter of various Scandinavian alphabets

2. REP 

Ex: my sister pilots æroplanes

2. REP /ei/

Ex: They're eating my fævorite food in the ætrium.

3. REP /æ/

UN: Used chiefly by linguists who are being weird. Often also used with other IPA symbols.

Ex: ðe bæt was eaten by ðe kæt.