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An auction call is the option to call a securitized bond usually after a set time period or after the deal's assets have amortized substantially.
Call option
As far as I know there isn't a "buy option," but a call option is an option to buy so I guess you could think of it as a "buy option."
Check out www.bondterrier.com which is an interactive learning tool dealing with Accounting for the Life-Cycle Events of Bond Liabilities that are (a) Convertible into Common Equity at the Holder's Option and (b) Callable at the Issuer's Option. Journal entries are provided for Issuance; Interest Payments; Discount/Premium Amortization; Conversion; Call; Maturity.
A covalent bond.
A call option allows its purchaser to buy ("call in") stocks at a certain price on a certain date--say, 100 shares of Walmart for $50 on November 1. A put option allows its purchaser to sell ("put") stocks on a certain price for a certain date. The seller of the option has to buy them (in a put) or sell them (in a call) if the option is exercised.
Such a bond is an convertible bond.
Regular call options have limited risk and unlimited upside gains while binary call options have limited risk along with limited upside gain.
It is called an ionic bond
An option buy is when you buy an option, whether call option or put option, using the Buy To Open order.
What do we call a chart that helps compare facts and numbers or quantities
It is called bond or chemical bond.