doubt regarding 0x prior to hexadecimal values

Hey,

Can you please help me to understand what is '0x' stands for prior to the hexadecimal number?

Protocol type   Value 
ARP          0x0806
PUP          0x0200
RARP        0x8035
IP            0x0800
IPv6        0x86DD
PPPoE      0x8863/0x8864
MPLS       0x8847/0x8848
IS-IS       0x8000
LACP       0x8809
802.1x    0x888E

Thanks in adv.

George

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