Meaning of Ceramic Capacitor markings
I am going to assume you didn't even google search. Before asking a question - try googling it. You'll be surprised at what you can find with 5 seconds to spare.

I googled K̄A5 and the first link is a Kemet PDF. 
http://www.kemet.com/Lists/ProductCatalog/Attachments/735/KEM_C1095_MIL-PRF-32535.pdf

Searching the document with again, the K̄A5, I find the following on page 12.