I thought it was an exclamation mark myself, but I suspect an American thought it would be cute to give that character a shorter name.
Most multisyllabic character names get shortened in various ways. According to the jargon file, "bang" originated at CMU.

In reply to Re^2: Clarify My doubt on #!/usr/local/bin/perl by ysth
in thread Clarify My doubt on #!/usr/local/bin/perl by kprasanna_79

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