What does u.fl means in k2h evm schematic?

Hello Denny,

The U4 channel of CLK1 and CLK2 is configured as a test clock and these clock outputs are terminated at RF coaxial connectors CN4, CN5, CN6 and CN23. The RF connector part number is U.FL-R-SMT-1(10) and U.FL mentions the connector style.

Hope this clarifies.

Regards,
Senthil