추신(追伸). 편지나 이메일 서명 뒤에 덧붙이는 말.
An abbreviation for 'postscript,' used to introduce an additional remark or message added to a letter or email after the signature.
예문:
"I forgot to mention the party details, so I added them in the P.S. at the bottom of the email."
"Her letter was short, but the PS contained the most important news about her move."
"PS: Don't forget to bring your swimming gear for the trip next week."
피코초(picosecond). 1조 분의 1초에 해당하는 시간 단위.
An abbreviation for 'picosecond(s),' a unit of time equal to 10⁻¹² (one trillionth) of a second.
예문:
"The laser pulse duration was measured in femtoseconds and picoseconds (ps)."
"In high-speed computing, signal propagation delays are often quantified in ps."
"A typical chemical reaction occurs over a timescale ranging from picoseconds to milliseconds."