Some of UI primitives

The Apple Human Interface Guidelines officially refer to it as the "spinning wait cursor". Its colloquial names include "spinning wheel of death", "beach ball of death", "hypnowheel", "spinning pizza", "spinning pinwheel", "pinwheel of death", "rainbow ball of doom", "the beach ball of hell", "spinning beach ball of death", "pin wheel of death", "rainbow wheel of death" and "marble of doom". The suffix "of death" in these names is a reference to Microsoft Windows' Blue Screen of Death (BSOD), which also leads to the acronym "SPOD" for "spinning pinwheel of death" or "spinning pizza of death," commonly used in mailing lists such as Mac-L. The suffix 'of doom' is also commonly used.

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