Hmm....I got this from their site....It seems like an umbrella is okay. The only thing I would be worried about is martial arts staffs....And any 'club-like' thing. But, since most of us have a pretty good sense of judgement....If you want the full thing it's here:
http://www.psu.edu/dept/police/weapons.html" The possession, carrying, or use of any weapon, ammunition, or explosive by any person is prohibited on all University property except by authorized law enforcement officers and other persons specifically authorized by the University. No person shall possess, carry, or use any fireworks on University property, except for those persons authorized by University and local governments to discharge such fireworks as part of a public display. Paintball guns and paintball markers may only be used on the property of the University in connection with authorized University activities and only at approved locations. Any University student or employee who violates these prohibitions shall be subject to discipline in accordance with regular University procedures, which may include suspension or dismissal from the University. Visitors to the University will be subject to appropriate trespass actions for failure to comply with these regulations. Further, if possession or use of a weapon, fireworks or paintball device is in violation of the law, it will be referred to University Police or other proper law enforcement authorities.
Definitions:
A weapon is any instrument or implement which is capable of inflicting serious bodily injury, and shall include but not be limited to:
Any rifle, shotgun, handgun, machine gun, or other firearm, or antique firearms suitable for use; any airgun, spring gun, B-B gun, or implement that is not a firearm, which propels a pellet of any kind with a force that can reasonably be expected to cause bodily harm; any starter pistol, flare gun, tranquilizer gun, stun gun, zip gun, spear gun, dart gun, sling shot; or ammunition of any type for weapons governed by these regulations.
Any knife with a blade larger than that of a folding pocket knife; dagger; razor or other cutting instrument, the blade of which is exposed in an automatic way by switch, push-button, spring mechanism, or otherwise.
Any striking instrument to include clubs, truncheons, blackjacks, sandbags, metal knuckles, or sap gloves.
Any martial arts weapons to include nunchakus, tonfas, staffs, and throwing stars.
Any bow and arrow combination.
Any device which discharges chemical irritant or tear gas and smoke grenades.
Any incendiary device to include flammable liquids enclosed in readily breakable containers that can be equipped with an igniter of any type.
Any explosive device to include hand grenades, bombs, black powder, smokeless powder, percussion caps, friction primers, and pyrotechnic fuses.
The term weapon does not include paintball guns and paintball markers, though they are not allowed."
