YP

YP may beYellow Pages (computing)the US Navy hull classification symbol for Training Patrol CraftYoung Professional, also known as a Yuppie.Yepp player names (such as YP-55)
See more at Wikipedia.org...

The Network Information Service or NIS (originally called Yellow Pages or YP) is Sun Microsystems’ client-server directory service protocol for distributing system configuration data such as user and host names between computers on a computer network.Sun licenses this technology to virtually all other Unix vendors.As the name “Yellow Pages” was a registered trademark in the United Kingdom of British Telecom PLC for their (paper) commercial telephone directory, Sun changed the name of their system to NIS, though all the commands and functions still start with “yp”.
See more at Wikipedia.org...

Yellow Pages. The original name for Sun's Network Information Service.
(1995-03-07)

حداکثر فشار یا اِسترسی که یک ماده می تواند تحمل نماید بدون اینکه تغییر شکل دائمی بیابد چه توسط جریان یافتن و چه توسط شکستن ، بیشتر برای خصوصیات گل حفاری بکار می رود
  

Yield Point, applying for Mud features