In French, "M" sounds like « aime » (love), but in English it doesn’t mean anything.
Then I imagined the same poster in French, but this time there’s no simple word for "I" or "B".
That made me notice something obvious: French vowels can be written with one letter (A → « a », E → « e »), while consonant sounds need combinations (B → « bé », C → « cé », D → « dé », H → « ache »…).
All except one vowel: Y.
If you try to write its sound, you get « igrec », literally « i grec », the Greek i: ipsilon.
Never too late to learn even the simplest things.