What do FC1 & FC2 refer to ?

What do FC1 & FC2 refer to ? fc2 s1 FC2 FIRE CONTROLMAN PETTY OFFICER 2ND CLASS FC3 FIRE CONTROLMAN PETTY S1 SEAMAN 1ST CLASS S2 SEAMAN 2ND CLASS Page 54 S3 SEAMAN 3RD CLASS SA SEAMAN fc21851398 Product Name, Adnaco-FC2 Fiber Type, Single-Mode, 9125 μm Connector type, LC-LC Number of Fiber Strands, Duplex Insertion loss, ≤ dB

fc21851398 FC2-PPV-4343600 - *Urgent [Limited time only until 331 All of them are home; trending; censored; SNIS-675 S1 x ATTACKERS Collaborative Variety

fc2 avple FC2 Wire & Cable Products ; Datasheets · Images · Newest Products · Types of Rectangular Cable Assemblies FC20 TN40A S1 B BX Weidmuller 2827220000  First class Same as 1A without AC - Coaches are numbered F1, F2, F3 or FC1, FC2 SL : Sleeper class - Coaches are numbered S1, S2, S3 etc; SH : High-capacity