How many terms are in this expression? [ 1+8 b+6 d ]

<br />To determine the number of terms in the expression $1+8b+6d$, we need to identify each part of the expression that is separated by a plus sign.<br /><br />The expression $1+8b+6d$ has three parts: $1$, $8b$, and $6d$. Each part is separated by a plus sign.<br /><br />Therefore, the expression $1+8b+6d$ has $\boxed{3}$ terms.