No. The hepatitis B vaccine series should not berestarted when doses are delayed; rather, the seriesshould be continued from where it left off. Thevaccine recipient should receive the second doseof vaccine now and the third dose 2â5 monthslater.
The symbol used by mathematicians to represent the ratio of a circle's circumference to its diameter is the lowercase Greek letter Ï, sometimes spelled out as pi, and derived from the first letter of the Greek word perimetros, meaning circumference. In English, Ï is pronounced as pie (/paÉª/, paÉª).
But why was pi chosen as the symbol for this ratio in the first place? Well, it was introduced by 18th-century Welsh mathematician William Jones, most likely, it's believed, because pi is the first letter of the Greek word for periphery (periphÃ©rion). Here's what it looks like in Greek: ÏÎµÏÎ¹ÏÎ­ÏÎµÎ¹Î±.