I frequently visit Singapore on short business trips, and have usually received a rounded rectangular (for brevity, "square") Visit Pass stamp. However, on my last visit, the officer first stamped a square stamp, cursed, crossed it out and stamped in a hexagonal one instead:
What, if anything, does the shape mean? As far as I can tell the text of the two stamps is completely identical. The officer said nothing to explain and my stays don't look like visa runs etc.