Stock that is issued without the specification of a par value indicated in the company's articles of incorporation or on the stock certificate itself.
Taobiz explains No-Par Value Stock
Most shares issued today are classified as no-par or low-par value stock. No-par value stock prices are determined by what investors are willing to pay for them in the market.
Companies find it beneficial to issue no-par value stock as they have flexibility in setting higher prices for future public offerings and have less liability to shareholders in the case that their stock falls dramatically.