"SexyCooldowns is a logarithmic cooldown bar. What's that, you say? Well, most timer bars you're used to are linear. That is, the distance between 0 seconds and 10 seconds is the same as the distance between 50 seconds and 60 seconds. A logarithmic cooldown bar is somewhat different - it represents cooldowns on a compressed timeline, so that cooldowns that are closer to being ready are represented as more active on the bar. This lets you represent a large amount of data on a single bar, and have it remain useful.
In short, SexyCooldown is a single consolidated timer bar for all your spell, pet's spell, item, and proc cooldowns, as well as buffs, debuffs, and totem timers. It's very flexible, and can be customized to fit into your UI as best you see fit."
This rows written by Antiarc, when he first time release their addon, the SexyCooldown. But Antiarc is not update the original addon since 4.1.