The term 'sample space' can be somewhat arbitrary. In this case, it might be any of the following (or another) possibility:
If order of flips is significant:
HHHH
HHHT
HHTH
HHTT
HTHH
HTHT
HTTH
HTTT
THHH
THHT
THTH
THTT
TTHH
TTHT
TTTH
TTTT
If order is not significant:
HHHH
HHHT
HHTT
HTTT
TTTT
If, say, only the number of either heads or tails is important:
4
3
2
1
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The sample space for tossing a coin twice is [HH, HT, TH, TT].
The sample space of tossing a coin is H and T.
The sample space when tossing a coin three times is [HHH, HHT, HTH, HTT, THH, THT, TTH, TTT]It does not matter if you toss one coin three times or three coins one time. The outcome is the same.
T 4, t 6, h 5 (apex)
(1,2,3,4,5,6][Heads,Tails] is a depiction of this notation. It is an expression of probability.