Generally, they represent network service providers or certain streaming sites the server can be used to watch. Here are meanings of some common abbreviations:

HKT: the network service provider of this server is Hong Kong Telecom

HKBN: the network service provider of this server is Hong Kong Broadband Network

APNIC: the network service provider of this server is Asia-Pacific Network Information Centre (Hong Kong)

HCM: the network service provider of this server is China Mobile Hong Kong

PCCW: the network service provider of this server is Pacific Century CyberWorks (Hong Kong)

HiNet: the network service provider of this server is Chunghwa Telecom (Taiwan)

Softbank: the network service provider of this server is SoftBank Group

Viaplay: the server can be used to watch Viaplay

Netflix: the server can be used to watch Netflix

VIU: the server can be used to watch VIU

AbemaTV: the server can be used to watch AbemaTV

iPlayer BBC: the server can be used to watch iPlayer BBC

Relay: this is a relay server, such as HK Relay which means the server is relayed via Hong Kong

BGP IPLC: the is a network auto-adaptation server