code: def rotated_mercator() -> ccrs.ObliqueMercator:
      return ccrs.ObliqueMercator(azimuth=90.0)
  
file_path: cartopy/lib/cartopy/tests/crs/test_oblique_mercator.py
imports: from copy import deepcopy
  from typing import Dict, List, NamedTuple, Tuple
  import numpy
  import pytest
  import cartopy.crs
  from .helpers import check_proj_params
label_desc: Use image node_id 2 for calling a global function with example usage: rotated_mercator() and returns: ccrs