263F

263F is an alphanumeric designation used in multiple systems to label discrete items. It does not correspond to a single widely recognized object, and its meaning is context-dependent.

In genetics and proteomics, sequences and mutation datasets sometimes use a shorthand like 263F to indicate the amino acid at position 263 being phenylalanine (F) in a given protein. The exact residue and its reference sequence must be specified, since different proteins have their own numbering.

In product catalogs and engineering documentation, 263F can serve as a model or part number assigned by manufacturers. Items labeled 263F can differ widely between product lines and industries, with no universal specification attached to the code itself.

In transportation planning, route or service codes may combine numbers and letters; 263F may be used as a code within a particular transit network to designate a scheduled service, stop pattern, or line segment. Again, the meaning is network-specific.

Because 263F has multiple unrelated meanings, users should rely on context or consult domain-specific catalogs to determine which reference applies.