Anonymous ID: 822056 May 9, 2020, 11:25 p.m. No.9106331   🗄️.is 🔗kun

>>9106313

Five by five is a radio communications expression that means 'loud and clear'. One of the fives represents the S units of reception strength. The other five is a rating of the signal clarity. Five by five is a good, clear signal. The radio use of this expression goes back to the 1950s