The following items are banned for security reasons in almost every airport. If you have any of them, to avoid facing extra hassle at the security, hand them to the luggage or the banned items section.
1) Firearms including all types of military equipment, flare guns, BB guns, compressed air guns, etc.
2) Toys looking like real firearms
3) Sharp objects including knives, box cutter, razors, swords, sabers, scissors, and similar items
4) Flammables including bullets, hand grenades, explosives, TNT, C4, dynamites, butane, fireworks
5) Sprays including pepper sprays, poisonous sprays, tear gas spray