The most memorable letter-as-logo is Barack Obama's "O," but before him, Hubert H. Humphrey (D) used a triple "H" in 1968, and one iteration of George W. Bush's (R) 2004 logo used just the "W." ...

when Mitt Romney ditched his 2008 full-name-with-eagle logo for a red, white, and blue letter R. By 2016, candidates like Rick Perry, Bobby Jindal, and Clinton used single-letter logos.

The speed at which your mind can connect the lips logo with the Rolling Stones and R, or the swoosh with Nike ... much adequate replacements for the letters of the alphabet. They’re just symbols ...

but the Rockstar Games logo was submitted in its own filings as evidence against the trademark application, suggesting its main issue is that they both prominently feature the letter “R.” ...

Those words describe the new logo for Volkswagen’s R and R-Line ... observers mightn’t immediately recognise it as being a letter 'R'. Designed in-house, it’s intended to be “modern ...