Protein symbol in output list

Question

[Mee]

Hello,

I've got a list of proteins like this:

[262] "sp|P68402|PA1B2_HUMAN"                                                                                                                                              
[263] "sp|P69849|NOMO3_HUMAN : sp|Q15155|NOMO1_HUMAN : sp|Q5JPE7|NOMO2_HUMAN"                                                                                              
[264] "sp|P78371|TCPB_HUMAN"                                                                                                                                               
[265] "sp|P78527|PRKDC_HUMAN"                                                                                                                                              
[266] "sp|P82909|RT36_HUMAN"

I am wondering which is the protein symbol (example first row: P68402 or PA1B2), why there is more than one symbol (P68402, PA1B2), and why in some cases (like in the row [263]) there is more than one protein.

Any help is welcome, thank you very much!

[microfuge]

For the multiple entries I presume Uniprot explains it ( https://www.uniprot.org/uniprot/P69849 ) Text from the page

"There are 3 copies of the NOMO gene on chromosome 16p12-p13: NOMO1 (AC Q5JPE7), NOMO2 (AC Q5JPE7) and NOMO3. All 3 are extremely similar, which makes their individual characterization difficult. Thus, most experiments probably do not discriminate between the different members. The results reported in other entries may therefore apply for this protein"