Initialism of click-through rate.
"The team celebrated their victory at ctr after winning the championship match."
Abbreviation of centre.
In plain English: CTR is short for click-through rate, which measures how often people who see an ad actually go to visit the website it links to.
"The driver pressed the ctr pedal to brake smoothly at the stoplight."
Initialism of Choose the Right.
"The new safety protocol was introduced as part of a Choose the Right initiative to prevent accidents before they happen."