im noob

Attack/Defense/Stamina is the norm unless specified by the poster.

What ShadowJago said as it matches the order of stats presented when you do the IV calculator on this site

When IV calculators first came out, the order Attack/Defense/Stamina quickly became the standard across the different websites and applications. Later Niantic added the in-game appraisal tool which lists in order HP/Attack/Defense so some sites changed to that order.

I always list my IVs as 15a/13d/12s just so people know.

(Also, since I've dropped another term you are likely to see: Stamina is a placeholder value for what the game code uses to calculate the current max HP value. Most of the time HP=Stamina, but while placed in a gym HP=2*Stamina.)