It’s “1-4-3 Day” today according to a declaration by PA Governor Tom Wolf.

As a code used by Mister Rogers, the numbers 1-4-3 stand for “I love you.”

Fred Rogers hosted the popular Mister Rogers’ Neighborhood from 1968 through 2001 and regularly used the code in his life and on his show. The Pennsylvania native died in Pittsburgh in 2003.

He often talked about kindness. In honor of his life, May 23 has been declared “1-4-3 Day.” It’s the 143rd day of the year.

Gov. Wolf said in a press release: “We know Pennsylvanians are grateful for and do good deeds for their neighbors every day. It’s one aspect that makes our commonwealth such a great place to live, work and to visit. 1-4-3 Day is a recognition and celebration of those collective efforts, and we hope it inspires even more acts of kindness.”

Thursday, May 23, marks the very first “1-4-3 Day” in Pennsylvania.

People are urged to use the hashtag, #143DayInPA, on social media.