What is SARS-CoV-2 isolate?

"SARS-CoV-2, the virus that causes COVID-19, was isolated in the laboratory"
https://www.cdc.gov/coronavirus/2019-ncov/lab/grows-virus-cell-culture.html

"We isolated SARS-CoV-2 from the oropharyngeal sample obtained from the patient with the first laboratory-confirmed SARS-CoV-2 infection in Korea."
https://pubmed.ncbi.nlm.nih.gov/32080990/

"SARS-CoV-2 was isolated from a 58-year-old man from Wuhan, China who arrived in Melbourne on 19 January 2020"
https://pubmed.ncbi.nlm.nih.gov/32237278/

"When SARS-CoV-2 is isolated from a COVID-19 patient, that virus is called an isolate."
https://www.virology.ws/2020/05/07/there-is-one-and-only-one-strain-of-sars-cov-2/

"first full-length SARS-CoV-2 isolate genome sequences from the Baltics region being made publicly available in early April."
https://www.medrxiv.org/content/10.1101/2020.09.08.20190504v2

"Here, infectious SARS-CoV-2 was successfully isolated from urine of a COVID-19 patient."
https://www.tandfonline.com/doi/full/10.1080/22221751.2020.1760144#

"severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) isolate Wuhan-Hu-1, also known as COVID-19."
https://www.snapgene.com/resources/coronavirus-resources/?resource=SARS-CoV-2_(COVID-19)_Genome

Genome sequence of SARS-CoV-2 isolate Cali-01, from Colombia, obtained using Oxford Nanopore MinION sequencing
https://nanoporetech.com/resource-centre/genome-sequence-sars-cov-2-isolate-cali-01-colombia-obtained-using-oxford-nanopore

Coding-Complete Genome Sequence of SARS-CoV-2 Isolate from Bangladesh by Sanger Sequencing
https://mra.asm.org/content/9/28/e00626-20