heat from fire, fire from heat
A phrase that transgender people use in voice training in order to stabilise resonance (R1) after finding the correct one. The phrase is created by Zhea aka Z from TransVoiceLessons and is popular in the trans voice training community, and widely known in the lgbt+ community in general.
Z (raising her R1 with voiceless 'h' sounds): Hhh... hhh... hhhh... hhhhhaa, heat from fire, fire from heat. Okay, cool. Now I'm using that resonance.