How can i know my pentakill ?

what does that mean

Well, I mean, conversation is the key. In order to get to know it, you need to open up about yourself first. Maybe ask your penta how its day was. Start with small talk and move on from there. Here's to hoping you can become acquainted with your pentakill.

While this is in the wrong boards, it's tough to know which board it goes to because its message is so unclear. If you're asking "How many pentakills did I have this year?" or "What champion did I get a pentakill with?" then this question is sometimes answered with the "Year in Review" that is done at the end of the season. Otherwise, I don't know what or where this information is given.

The best place this might be answered is in Gameplay or perhaps General Discusison.