401 402 403 501 601 602 808 What does it all mean???

[Penru]

I am confused as all get out. Could someone please explain to me what these numbers mean!

 

[Morandir835]

Penru (sir or Ms.?) those are the different types of connection for ecigs. The 3 most heavily used are the 510, 808, & 901. There are quite a few differences in each type from airflow, voltage, to mah. Hope this helps somewhat.