Round Lot

generally accepted unit of trading on a securities exchange. On the New York Stock Exchange, for example, a round lot is 100 shares for stock and $1,000 or $5,000 par value for bonds.
In inactive stocks, the round lot is 10 shares. Increasingly, there seems to be recognition of a 500-share round lot for trading by institutions.
Large denomination certificates of deposit trade on the over the counter market in units of $1 million. Investors who trade in round lots do not have to pay the differential charged on Odd Lot trades.

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The normal unit of trading for a security, which is generally 100 shares of stock.

Investopedia Says:
Anything less than 100 shares is considered an odd lot.

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