mechanical offset
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Surgical Shooting: Mastering Mechanical Offset

For our purposes, mechanical offset relates to the difference between the line of bore and the line of sight. This distance will vary from one gun to another. Additionally, the sight and mounting system will also influence the difference. All handheld firearms have a certain amount of mechanical offset. It may be negligible in the case of a pistol, or significant in the case of certain rifles/carbines.
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The Rule of Two: Backup, Backup, Backup

At first glance, being armed with a loaded pistol seems adequate for most situations. If you make the gun a Glock 17, you have 18 tries to stop an armed assailant. If you carry a gun, a quality light should always be with you. I habitually carry a Surefire E2 Executive, even in my briefcase on an airplane.