penrose triangle

Questions

What does penrose triangle mean?

An optical illusion depicting an impossible solid object made of three straight beams of square cross section which meet pairwise at right angles at the vertices of the triangle they form.

Where does penrose triangle come from?

Named after English mathematician Roger Penrose (1931–) who popularised it in the 1950s.

How to pronounce penrose triangle

1. Open the pronunciation page — Open the Speakur entry for “penrose triangle”.
2. Read the phonetic spelling — Read the IPA spelling () so you know which sounds to aim for.
3. Play the audio — Click Play to hear reference audio for “penrose triangle”.
4. Repeat and practice — Say “penrose triangle” aloud, matching stress and vowels until it feels natural.