It's a reference to the "first quarter" of iPhone SE sales, i.e. the first 90 days after the model was launched.
The full transcript is available here:
https://seekingalpha.com/article/39...-results-earnings-call-transcript?part=single
"In both cases, that strategy is working. Our initial sales data tells us that the iPhone SE is popular in both developed and emerging markets, and the percentage of iPhone SE sales going to customers who are new to iPhone is greater than we've seen in the first weeks of availability for other iPhones launched in the last several years.
Overall, we added millions of first-time smartphone buyers in the June quarter, and switchers accounted for the highest percentage of quarterly iPhone sales we've ever measured. In absolute terms, our year-to-date iPhone sales to switchers are the greatest we've seen in any nine-month period, and our active installed base of iPhones is up strong double-digits year over year."
Some of the news outlet shorted Tim Cook's statement to say "first quarter" as it wouldn't make any sense for Tim to be talking about Q1 in a July earnings call.