Round lot

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Also called board lot. An order of trading 100 (or hundreds) shares of security. It is opposed to odd-lot order where the order is less than 100 shares of security. Historically, some brokers charge higher commissions for odd-lot orders. But it is not clear if brokers still charge more for odd-lot orders.

For US stocks, a board lot (or round lot) is usually 100 shares. For Canadian stocks the board lot size depends on the previous close price. If the previous close is under $0.10 a board lot is 1000 shares. Otherwise if the previous close is under $1.00 a board lot is 500 shares. Otherwise a board lot is 100 shares.